User manual

Release Notes for Catalyst 6500 Series Content Switching Module Software Release 2.2(8)

78-12569-16

Caveats

Resolved Caveats in Software Release 2.1(2)

This section describes caveats that have been resolved in CSM software release 2.1(2).

• CSCdw05136

In CSM software release prior to 2.1(1), IP fragments are not supported and are dropped. In software

release 2.1(1) of the CSM code, a simple form of support for handling UDP fragments was added.

There is a defect in the code handling UDP fragments in 2.1(1). When a CSM running software

release 2.1(1) receives UDP fragments, the system may exhibit very substantial performance

degradation and instability, possibly resulting in the CSM crashing. This defect is fixed in CSM

software release 2.1(2).

Workaround: When running software release 2.1(1) ensure the CSM does not receive UDP

fragments.

• CSCdw09396

In CSM software release 2.1(1), when the CSM examines HTTP headers that cross multiple packets,

it is possible that some connections will hang indefinitely. This defect is fixed in CSM software

version 2.1(2).

• CSCdw09585

When two CSMs are configured as a redundant pair and reside in the same Catalyst 6500 Series

chassis, the advertise active and advertise always commands may fail to advertise routes to the

associated VIP after a failover has occurred. When the currently active CSM fails, advertised routes

are correctly removed from the route table, but these routes are not re-inserted once the standby

CSM becomes active. If the active and standby CSMs reside in two different chassis, the advertise

commands work properly when a failover occurs. This defect is fixed in version 2.1(2) of the CSM

software.

• CSCdw16020

When POST requests are sent by a client through a Layer 7 virtual server with persistent rebalance

enabled, the connection may hang. This is particularly true for large amounts of data in the POST

request.

Workaround: Do the following for this defect:

–

Ensure that no POST requests are sent to virtual servers with resistant rebalance enabled.

–

Ensure that POST requests with small amounts of data (<200 bytes) are sent to virtual servers

with persistent rebalance enabled.

–

Turn off persistent rebalance on virtual servers that are enabled for layer 7 analysis and that

receive POST requests with large amounts of data.

This defect is fixed in CSM software release 2.1(2).

• CSCdw24071

In CSM software version 2.1(1) or earlier, the CSM may crash if it receives a TCP RST frame on a

connection at an inappropriate time. In particular, this condition may be triggered if an RST arrives

immediately following a valid data frame on the same connection. This condition can occur

infrequently and can be prevalent when there are many packet drops or errors in the network due to

congested or defective servers or overloaded transmission links. This defect is fixed in CSM

software release 2.1(2).